Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-09-26
1991-12-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
050721836
ABSTRACT:
An rf generator for magnetic resonance imaging apparatus including a modulator in which a carrier is modulated with an envelope signal, and a transmitter stage which is connected subsequent to the modulator generator in which the implementation of the modulating signal enables the expenditure for the transmitter stage be substantially reduced in that the modulator comprises a first modulator section in which the envelope signal is converted into a series of equally long digital pulses whose density corresponds to the amplitude of the envelope signal, in that k different kinds of pulses are provided, in that during each pulse of a given kind the carrier is always switched on with a given phase position which deviates from the phase positions of the carrier which are associated with the pulses of the other kinds by 360.degree./k or an integer multiple thereof, and in that the resultant pulse-wise switched, preferably square-wave carrier acts as a switching signal for the transmitter stage.
REFERENCES:
patent: 3581191 (1971-05-01), Anderson
patent: 3681680 (1972-08-01), Ernst
patent: 3786341 (1974-01-01), Anderson
patent: 3909705 (1975-09-01), Tschopp
patent: 3968424 (1976-07-01), Ernst
patent: 4327327 (1982-04-01), Greenwood et al.
patent: 4656424 (1987-04-01), Tsur et al.
patent: 4682106 (1987-07-01), Vatis et al.
patent: 4694254 (1987-09-01), Vatis et al.
McKinnon Graeme
Proksa Roland
Slobod Jack D.
Tokar Michael J.
U.S. Philips Corp.
LandOfFree
RF generator for magnetic resonance imaging apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF generator for magnetic resonance imaging apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF generator for magnetic resonance imaging apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1043330